laptop note-takers tested immediately after a class could recall more of a lecture and performed slightly better than their pen-pushing classmates when tested on facts presented in class.

Any advantage, though, is temporary. After just 24 hours, the computer note takers typically forgot material they’ve transcribed, several studies said. Nor were their copious notes much help in refreshing their memory because they were so superficial.

those who took notes by hand could remember the lecture material longer and had a better grip on concepts presented in class, even a week later. The process of taking them down encoded the information more deeply in memory, experts said. Longhand notes also were better for review because they’re more organized.

The problem is a typist’s tendency to take verbatim notes. “Ironically, the very feature that makes laptop note-taking so appealing—the ability to take notes more quickly—was what undermined learning,” said Dr. Kiewra.